public void actionPerformed(ActionEvent ae) { if (ae.getSource() == b1) { try { Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "123"); PreparedStatement ps = con.prepareStatement("select * from LoginForm where username=? and password=?"); String UserName = t1.getText(); String Password = jp1.getText(); ps.setString(1, UserName); ps.setString(2, Password); ResultSet rs = ps.executeQuery(); boolean flag = rs.next(); if (flag) { new Main(); f.setVisible(false); } else { JOptionPane.showMessageDialog(null, "Please Enter valid Name And Password"); } } catch (Exception e) { System.out.println("Error:" + e); } } else if (ae.getSource() == b2) { t1.setText(""); jp1.setText(""); } else if (ae.getSource() == b3) { f.setVisible(false); } }